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Mol Cell Biochem. 1994 Sep;138(1-2):53-9.

Histone shuttling by poly ADP-ribosylation.

Author information

1
University of Zürich-Tierspital, Institute of Pharmacology and Toxicology, Switzerland.

Abstract

The enzymes poly(ADP-ribose)polymerase and poly(ADP-ribose) glycohydrolase may cooperate to drive a histone shuttle mechanism in chromatin. The mechanism is triggered by binding of the N-terminal zinc-finger domain of the polymerase to DNA strand breaks, which activates the catalytic activities residing in the C-terminal domain. The polymerase converts into a protein carrying multiple ADP-ribose polymers which displace histones from DNA by specifically targeting the histone tails responsible for DNA condensation. As a result, the domains surrounding DNA strand breaks become accessible to other proteins. Poly(ADP-ribose)glycohydrolase attacks ADP-ribose polymers in a specific order and thereby releases histones for reassociation with DNA. Increasing evidence from different model systems suggests that histone shuttling participates in DNA repair in vivo as a catalyst for nucleosomal unfolding.

PMID:
7898476
DOI:
10.1007/bf00928443
[Indexed for MEDLINE]

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